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NEET Chemistry MCQ
D- And F- Block Elements Mcq Neet Chemistry
Quiz 6
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Q.1
Transition elements forms alloys easily because they have ..
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a) same atomic number
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b) same electronic configuration
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c) nearly same atomic size
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d) all of the above
Explanation
Answer: (c)
Q.2
Which form contains the maximum percentage of carbon? [ PET 1990]
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a) Fe(CO)4
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b) Fe(CO)5
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c) Fe(CO)6
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d) Fe(CO)7
Explanation
Answer: (b)
Q.3
Stainless steel does not rust because ... ..
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a) Nickel present in it does not rust
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b) Iron forms a hard chemical compound with chromium present in it
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c) Chromium and nickel combine with iron
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d) Chromium forms an oxide layer that protects iron from rusting
Explanation
Answer: (d)
Q.4
Which one of the following characteristics of the transition metals is associated with their catalytic activity? [ AIMPT 2003]
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a) Colour of hydrated ions
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b) Variable oxidation states
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c) High enthalpy of atomisation
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d) Paramagnetic behavior
Explanation
Answer: (b)
Q.5
Substances which does not react with cold water but react with steam are
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a) C, Ca, SO2
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b) Fe, Al Cl2
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c) CO2 , Na, Mg
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d) C, Fe, Mg
Explanation
Answer: (c)
Q.6
Number of electrons transferred in each case when KMnO4 acts as an oxidizing agent to give MnO2, Mn2+, Mn(OH)3 and MnO42- are respectively ..[ AIEEEE 2002]
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a) 3, 5, 4 and 1
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b) 4, 3, 1, and 5
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c) 1, 3, 4 and 5
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d) 5, 4, 3 and 1
Explanation
Answer: (a)
Q.7
Transition metals in their compounds show
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a) ioonic bonds
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b) covalent bonds
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c) ionic and covalent bonds
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d) ionic and coordination bonds
Explanation
Answer: (c)
Q.8
Cinnabar is an ore of … [ AIPMT 1991]
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a) Hg
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b) Cu
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c) Pb
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d) Zn
Explanation
Answer: (a)
Q.9
Potassium manganite (K2MnOsub>4) is formed when
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a) Cl2 is passed in to an aqueous KMnO4 solution
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b) MnO2 is fused with KOH in air
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c) formaldehyde reacts with KMnO4 in presence of strong alkali
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d) KMnO4 reacts with concentrated H2SO4
Explanation
Answer: (b)
Q.10
The most durable metal plating on iron to protect against corrosion is … [ AIPMT 1994]
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a) Nickel plating
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b) Tin plating
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c) Copper plating
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d) Zinc plating
Explanation
Answer: (d)
Q.11
Which metal sulphide is not black?
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a) NiS
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b) CoS
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c) CuS
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d) ZnS
Explanation
Answer: (d)
Q.12
In acidic medium, H2O2 changes Cr2O72- to CrO5 which has two ( - O – O - ) bonds Oxidation state of Cr in CrO5 is
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a) +5
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b) +3
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c) +6
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d) -10
Explanation
Answer: (c)
Q.13
Calomel reacts with ammonium hydrosixe to form …[ AIEEE 2005]
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a) Hg(NH2)Cl
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b) H2N-Hg-Hg-Cl
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c) Hg2O
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d) HgO
Explanation
Answer: (a)
Q.14
The grey cast iron contains
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a) Iron carbide
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b) Silcon carbide
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c) Silicon dioxide
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d) Graphite
Explanation
Answer: (d)
Q.15
The basic character of the transition metal monoxides follows the order ( At. No Ti=22, V = 23, Cr=24, Fe = 26) [ AIPMT]
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a) TiO > FeO > VO > CrO
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b) TiO > VO > CrO > FeO
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c) VO > CrO > TiO > FeO
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d) CrO > VO > FeO > TiO
Explanation
Answer: (b)
Q.16
Which of the following statements about the interstitial compounds is incorrect? [ NEET 2013]
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a) They retain metallic conductivity
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b) They are chemically reactive
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c) They are much harder than the pure metal
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d) They have higher melting points than the pure metals
Explanation
Answer: (b)
Q.17
For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? ( At. nos Cr = 24, Mn = 25, Fe = 26, Co = 27)
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a) Cr > Mn > Co > Fe
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b) Mn > Fe > Ce > Co
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c) Fe > Mn > Co > Cr
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d) Co > Mn > Fe > Cr
Explanation
Answer: (b)
Q.18
In context with the transition elements, which of the following statements is incorrect? [ AIEEE 2009]
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a) In the highest oxidation states, the transition metal show basic character and form cationic complexes
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b) In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d-electrons are used for bonding
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c) Once the d5 – configuration is exceeded, the tendency to involve all the 3d –electrons in bonding decreases
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d) In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes
Explanation
Answer: (a)
Q.19
Most common oxidation states shown by cerium are …[ AIEEE 2002]
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a) +2, +4
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b) +3, +4
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c) +3, +5
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d) +2, +3
Explanation
Answer: (b)
Q.20
What is the atomic number of the element with M2+ ion having electronic configuration [Ar] 3d8 [Gujarat-2009]
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a) 26
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b) 27
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c) 28
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d) 25
Explanation
Answer: (c)
Q.21
More number of oxidation states are exhibited by the actinides than by the lanthanides. The main reason for this is …[ AIPMT 2005]
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a) More energy difference between 5f and 6d- orbitals than that between 4f anda 5d-orbitals
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b) Lesser energy difference between 5f and 6d- orbitals than that between 4f and 5d orbitals
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c) Greater metallic character of the lanthanides than that of the corresponding actinides
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d) More active nature of the actinides
Explanation
Answer: (b)
Q.22
Match Column-A and Column-B properly
Stainless steel
a. In reveting
Bronze
b. In antic piece
Nitinol
c. Nitinol
German silver
d. To make surgical appliances
-- --
e. Cu (75-85%) NI (25-15%)
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a) 1 → e; 2 → d; 3 → b; 4 → c
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b) 1 → e; 2 → d ; 3 → b; 4 → c
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c) 1 → e; 2 → c; 3 → a; 4 → b
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d) 1 → e; 2 → c; 3 → a; 4 → d
Explanation
Answer: (a)
Q.23
Which of the following processes does not involve oxidation of iron? [ AIPMT 2015]
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a) Rusting of iron sheets
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b) Decolourisation of blue CuSO4 solution by iron
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c) Formation of Fe(CO)5 from Fe
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d) Liberation of H2 from steam by iron a high temperature
Explanation
Answer: (c)
Q.24
Permanent magnets are generally made of alloys of .... ...
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a) Co
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b) Zn
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c) Sb
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d) Pb
Explanation
Answer: (a)
Q.25
Mercury is purified by ..[ PET 1990]
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a) Solidifying
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b) Distillation in vacuum
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c) Treatment with dil. HNO3
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d) Electrolytic method
Explanation
Answer: (b)
Q.26
With decrease in size of cation:
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a) Complex forming tendency decreases.
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b) Complex forming tendency increases.
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c) Complex forming tendency does not change.
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d) None of these.
Explanation
Answer: (b)
Q.27
In the dichromate dianion …[ IIT 1999]
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a) 4 Cr-O bonds are equivalent
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b) 6 Cr-O bonds are equivalent
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c) All Cr-O bonds are equivalent
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d) All Cr-O bonds are non-equivalent
Explanation
Answer: (b)
Q.28
All metal chlorides are soluble in water except those of
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a) Ag, Pb, Hg
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b) Na, K, Ca
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c) Zn, Cu, Cd
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d) Be, Sr, Li
Explanation
Answer: (a)
Q.29
Which will reduce acidified potassium dichromate solution?
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a) Potash alum
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b) Mohr’s salt
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c) Chile saltpeter
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d) White vitriol
Explanation
Answer: (b)
Q.30
Acidified potassium dichromate is treated with hrdrogen sulphide. In the reaction the oxidation number of chromium ..[ PET 1996]
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a) Increases from +3 to +6
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b) Decreases from +6 to +3
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c) Remain unchanged
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d) Decreases from +6 to +2
Explanation
Answer: (b)
0 h : 0 m : 1 s
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